Drug interactions
Physostigmine + Rivastigmine
Severity: Major
Physostigmine and Rivastigmine: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs inhibit acetylcholinesterase, so combining them can cause cholinergic excess including bradycardia, bronchospasm, vomiting, salivation and seizures. Physostigmine crosses into the CNS and has a narrow therapeutic window.
What this interaction means in plain words
Physostigmine and Rivastigmine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive cholinesterase inhibition.
What to do
Avoid concurrent use unless clinically necessary, and monitor heart rate, respiration and neurological status closely. Have atropine available to treat cholinergic toxicity.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Rivastigmine
Frequently asked questions
Can I take Physostigmine with Rivastigmine?
MediHelp rates the interaction as major. Physostigmine and Rivastigmine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Both drugs inhibit acetylcholinesterase, so combining them can cause cholinergic excess including bradycardia, bronchospasm, vomiting, salivation and seizures. Physostigmine crosses into the CNS and has a narrow therapeutic window.
How serious is the interaction between Physostigmine and Rivastigmine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concurrent use unless clinically necessary, and monitor heart rate, respiration and neurological status closely. Have atropine available to treat cholinergic toxicity.
What other medicines interact with Rivastigmine?
MediHelp also lists interactions of Rivastigmine with, for example, Donepezil, Galantamine, Memantine-donepezil. The full list is on the Rivastigmine page.
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